
body,ul,li,dl,dt,dd,p,ol,h1,h2,h3,h4,h5,h6,form,img,table,fieldset,legend{margin:0; padding:0;}
ul,li,ol{list-style:none;}
img,fieldset{border:0; }
img{display:block;}
a{text-decoration:none; color: #1a1a1a;}
body{font-size:16px; font-family:"微软雅黑";background: #f6f6f6;}
button,input,a{outline:none;border:0;}




header{  
    position: relative;
    min-width: 1032px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 1px 3px rgba(26,26,26,.1);
    background-clip: content-box;
}
.app-header{
        position: relative;
        display: flex;
        width: 1000px;
        height: 52px;
        padding: 0 16px;
        margin: 0 auto;
        align-items: center;
        transition: transform .3s;
}
.Icon {
    vertical-align: text-bottom;
    fill: currentColor;
}
.ZhihuLogo {
    fill: #0084ff;
}
.AppHeader-nav.AppHeader-nav {
    display: flex;
    justify-content: space-between;
    height: 30px;
    margin-right: 18px;
    margin-left: 27px;
}
.AppHeader-navItem{
    padding: 0 15px;
    font-size: 15px;
    line-height: 30px;
    color: #8590a6;
}
.AppHeader-navItem:first-child {
    padding-left: 0;
}
.SearchBar {
    display: flex;
}
.SearchBar-toolWrapper {
    position: relative;
    z-index: 104;
    width: 326px;
}
.SearchBar-tool {
    position: relative;
    float: left;
    overflow: hidden;
}
.SearchBar-tool .Popover {
    display: block;
}
.Input-wrapper {
    position: relative;
    display: flex;
    width: 180px;
    height: 34px;
    padding: 4px 10px;
    font-size: 14px;
    background: #fff;
    border: 1px solid #ebebeb;
    border-radius: 3px;
    box-sizing: border-box;
    transition: background 0.2s,border 0.2s;
}
.SearchBar-input {
    width: 326px;
    transition: width .2s ease,background .3s ease;
}
.Input-wrapper.Input-wrapper--grey {
    background: #f6f6f6;
}


input.Input {
    background: #f6f6f6;
    color: #1a1a1a;
    height: 24px;
    line-height: 24px;
}
.Input-after {
    position: absolute;
    top: 50%;
    right: 10px;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    margin: auto;
    -webkit-transform: translate3d(0,-50%,0);
    transform: translate3d(0,-50%,0);
}
.SearchBar-searchIcon {
    position: absolute;
    right: -11px;
    top: -17px;
    bottom: -17px;
    background: transparent!important;
    border: none!important;
    padding: 0 12px;
    border-bottom-left-radius: 0;
    border-top-left-radius: 0;
    transition: fill .3s ease;
}
.Button {
    display: inline-block;
    padding: 0 16px;
    font-size: 14px;
    line-height: 32px;
    color: #8590a6;
    text-align: center;
    cursor: pointer;
    background: none;
    border: 1px solid;
    border-radius: 3px;
}
.Button--blue {
    color: #0084ff;
    border-color: #0084ff;
}
.SearchBar-askButton {
    z-index: 103;
    padding: 0 14px;
    margin-left: 16px;
    transition: opacity .3s ease,-webkit-transform .3s ease;
    transition: opacity .3s ease,transform .3s ease;
    transition: opacity .3s ease,transform .3s ease,-webkit-transform .3s ease;
    line-height: 30px;
}
.Button--primary.Button--blue {
    color: #fff;
    background-color: #0084ff;
}
.AppHeader-userInfo {
    flex: 1;
    justify-content: flex-end;
    display: flex;
    align-items: center;
}
.Popover {
    position: relative;
    display: inline-block;
}
.AppHeader-messages, .AppHeader-notifications, .AppHeader-resume {
    margin-right: 40px;
}
.Button--link, .Button--plain {
    height: auto;
    padding: 0;
    line-height: inherit;
    background-color: transparent;
    border: none;
    border-radius: 0;
}
svg:not(:root), symbol, image, marker, pattern, foreignObject {
    overflow: hidden;
}    
